National Geographic Travelのインスタグラム(natgeotravel) - 1月18日 06時06分

Photo by @kiliiiyuyan | Tundra polygons are shaped by thousands of years of freezing and thawing and an underlying permafrost layer. These polygons are the key to the marshlands that make excellent bird nesting areas, as they create small, shallow lakes surrounding dry ground. Here, they’re seen at Qupaluk in the Alaskan Arctic in late June. #alaska #tundra #arctic

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